Electrical checking device



p 1954 c. 1.. SINGLETON ELECTRICAL CHECKING DEVICE Filed Feb. 13, 1952 4 Sheets-Sheet 1 v N m3 ww N5 h MN Q Q Q Q mm \WMN O N\, m wax h 0m: wi

4" 3X m5 mmW 1NV ENTOR Charles L. Smq/efon ATTORNEYS.

Sept. 14, 1954 c. SINGLETON 2,689,338

ELECTRICAL CHECKING DEVICE Filed Feb. 13, 1952 4 Sheets-Sheet 2 .INVENTOR. Charles L. Sinq/gfon.

ATTORNEYS.

C. L. SING LETON ELECTRICAL CHECKING DEVICE Sept. 14', 1954 4 Sheets-Sheet 3 vw :BEEMJNAM msilllg ar/ es L. Single/"0n.

Filed Feb. 13, 1952 ATTORNEYS.

Sept. 14, 1954 Filed Feb. 13, 1952 C. L. SINGLETON ELECTRICAL CHECKING DEVICE 4 Sheets-Sheet 4 INVENTOR. Charles L. Siny/efon.

A T TORNEYS.

Patented Sept. 14, 1954 ELECTRICAL CHECKING DEVICE.

Charles L. Singleton, Kansas City, Mo.-, assignoi of twelve and one-half per cent to Dan Silver' stein, twenty-five per cent to Joseph Si thirty-seven and one-half per cent to Norman C. Weiss, and seventeen and one-half per cent.

' to Warren W. Wormington, all of KansasCity,

Application February 13, 1952; seriamu. 2.712314.

10 Claims. 1.

This invention relates to a checking apparatus for setting up and remotely indicating the condition of transactions that are designated especially by numbers. For example, customers accounts in large department stores are identi-- fied by numbers for convenience of the clerks in checking accounts and for use of credit plates and cards which are issued to the customers.

These credit cards or plates bear the customers name and account number which the customer presents to the clerk whenever a purchase is made. The clerk, in making out the sales slip, uses the number which identifies the customer,

but before the transaction is completed, the clerk must call the credit department of the store to determine whether or not the account remains active. This check takes up the clerlcs and customers time for. the credit department to look up the account and report the condition of the account back to the clerk. Also, such check ups are at times embarrassing to the customer.

It is, therefore, an object of the present in.- vention to provide an apparatus whereby the activity of an account represented by the numbers may be kept set up by the credit department, and the activity of the account is checked directly by the clerk so that no waiting is required on the part of the clerk or the customer.

Other objects of the invention are to provide a central apparatus of this characterthat is set upto indicate inactive accounts by fusing circuits representing the inactive account num bers; and to provide a plurality of remote stations with indicators adapted to' be actuated to;

indicate the set up for-any particular number.

Other objects are to provide. an apparatus that is, relatively simple in construction,v positive in: operation, and which is readily serviced to lie-- establish fused. circuits. when desired.

In accomplishing these andother objects of the invention hereinafter pointed out, I have. provided improved structure, the preferred form. of which is illustrated .in the accompanying.draw'-- Fig. 6 is a section througha portion of the fuse switch hank on the line 6-6 of Fig. 4. Fig. '7 is a-rear end of-the fuse unit.

Fig; 8 is a longitudinal section through the fuse unit but with the upper fuse cylinder in eleva tion and aportion thereof: broken away at the" point of the section.

Fig. 9 is an-enlarged-fragmentary section of two of the fuse cylindersshowi-ng engagement. thereof with one ofthe contactsaof the contact dis-ks;

Referring more in detail: to the: drawings:

I designates an apparatus constructed in accordance withthe-present invention and which includes one or more dialing and indicating units: 2, a master control unit 3-, and a circuit set upunit 4' whereby a number may be dialed to set up a circuit for connection with a fuse element and which effects activation of a signal atthe dialing station to: indicate an active or. inactive account.

The fuse switch bank. includes a plurality of assemblies 5 each havingashaft 6 carrying a plu rality of insulatingd-isksl that are fixed to the shaft. B-to rotate therewith. Interposed between the insulated disks 1 are stationary disks!) carrying contacts 9; In the" illustrated. instance, the contacts 9 are arranged in an inner. and outer circular series In and H with the contacts in-the inner series staggered. with respect to the con tacts in the outer seriesand spaced apart so that a switcharm i=2 for each disk. 8 can engage only one contact ata timer Extending about the periphery of thedisks 8 is a cylinder t3: formedof fusible material, for

example, a relatively thin metal foil which may t2 extend. radially from conductor rings [6 that are fixed to the peripheriesof theinsulating disks 1. Contacting each conductor ring is a brush H by which an electric current may be conducted'from-a relatediterminal I8. Each stationary contact diskfi'has one of. the terminals l8 and the terminalsa-re insulated with respect to switch units designated 22, 23, 24, 25, and 26, shown in Figs. 1 and 2. Each unit may be provided with 2,000 disks with 100 contacts on each disk giving a total of 1,000,000 contacts. The contact disks may be relatively thin and closely mounted on the rotating shafts and the units may be grouped about a common axis as shown in Figs. 1 and 2.

Each of the respective cylinders is provided with a terminal 21 for connecting conductors 28. It is obvious that if a fusing current is passed through conductors 9 and 28 and the contact arm I2 is engaged with a contact'9, the fuse cylinder will be fused at that contact point, that is the material of the cylinder l3 will melt at the point of connection of the contact with the cylinder and open up a hole with the result that an indicating current cannot be closed through the conductors l9 and 28 by way of that contact, because there is then no connection between that contact point and the cylinder. Thereforethe circuit is open and a negative signal is given at the dialing station. If the connection for that particular contact with the fuse cylinder is intact the circuit through the cylinder is completed and, then the indicator at the dialing station will indicate an active credit account, as later described.

As above stated, the cylindrical fuse elements are arranged about a common axis and each shaft 6 is provided at one end with a driving gear 29 that meshes with a drive gear 30 common to all the gears 28. The drive gear 30 is fixed to a quill shaft 3| mounted in the axis about which the fuse elements are grouped as best shown in Fig. 8, the cylinders being supported by a frame 32. The quill shaft 3| is mounted on a fixed shaft 33 carried by a bracket 34 at one end as shown in Fig. 8.

The contact arms l2 are kept in zero position, that is, in stopped engagement with insulating rods 35 by a spring 36. The rods 35 extend through the stationary disks and may also be used to support the disks in their required relationship.

The quill shaft 3| is rotated in a forward direction by a motor 31 through a slip drive mechanism, later described, and by a ratchet wheel 38 that is mounted on the shaft 3| and which carries a plurality of pins 39 arranged on the gear 39 in a circular series and adapted to be successively engaged by a pawl 40 actuated by an electromagnet relay 4|, there being ten pins 39 so that with each operation of the electro-relay 4 l, the contact arms are advanced ten contacts.

A second relay 42 is provided to actuate a pawl 43 that engages teeth 44 on the periphery of the gear wheel 38 to advance the wheel one tooth or one contact at a time. The pawls are arranged to effect rotation of the gear 38 in the direction of rotation by the motor 31 and to tension the coil spring 36 that is wrapped about the shaft 33 and has one end fixed to the shaft or rod 33 and the other end fixed to the gear wheel 38 as indicated at 45. The gear wheel 38 is retained from backward rotation under action of the tension spring 36 by means of a click 46 that also engages the teeth of the gear wheel 38 and which is adapted to be released by a relay magnet 41 when the switch arms of the fuse element assemblies are to be returned to their zero position, as later described.

The slip drive of the motor comprises a pulley 48 that is fixed to the quill shaft. Operating over the pulley 48 is a belt 49 that is driven by a pulley 50 on the shaft of the motor 31. The motor is adjustably mounted on slides to tension the 4 belt so that the belt will slip and in itself will not turn the shafts of the cylinder assemblies.

The switch banks 29 and 2| are of generally the same construction as the fuse element assemblies with the exception that the fuse cylinders l3 are omitted, their function being to make the contact representing a given account number.

The switch bank 20 includes a shaft 52 mounting a single insulating disk 53 carrying a conductor ring 54 having a radially projecting contact arm 56 adapted to engage contacts 51 that are carried on a fixed insulating disk 58 in the same manner as the contacts previously described. However, in this instance, each contact is connected by an individual conductor 59. The contact arm 56 is normally kept in zero position or against an insulating stop 60 which supports a brush 62 that makes contact with the conductor ring 54, the brush 82 being provided with a terminal 63 to which a conductor 64 is connected. The conductors may be carried by a cylindrical housing 65 that encircles the disk 58.

The shaft 52 is rotated to move the contact arm 56 from zero position by a ratchet wheel 66 against action of a return spring 61. The ratchet wheel 66 is provided with a circular series of pins 68 that are adapted to be successively engaged by a pawl 69 actuated by a relay 10 to effect advance of the contact arm 56 to engage every tenth contact.

To engage the intermediate contacts, the ratchet wheel is actuated by a pawl 1| engaging peripherial teeth 12 of the ratchet wheel so that the contact arm may be moved one contact at a time under operation of a relay 13, Fig. 2. The ratchet wheel 66 is stopped by a click 14 released by an'electromagnet 15.

The switch bank 2| conforms to the construction of the switch bank 20. However, this switch bank includes one hundred stationary disks 16, each carrying a hundred contacts 11 arranged in accordance with the arrangement of the contacts on the other disk. Each contact is connected by a conductor IS with a related disk in the fuse element assembly. 1

The switch bank 2| also has insulating disks 18 that are fixed to a quill shaft 19. Each insu lated disk carries a conductor ring having a contact arm 9|. Each conductor ring 80 is provided with a brush contact 82 that is carried by an insulating rod 83 extending through all the respective contact disks. Connected with the respective brushes are individual terminals 04 for connection by a conductor 59 leading from a related contact of the switch bank 20.

The quill shaft 19 for the switch bank 2| is actuated to turn the contact arms in steps of ten by a relay 85 that operates a pawl 86 engaging pins 81 on the face of a ratchet wheel 88 in the same manner as the relays 4| and 10, previously described. The shaft is rotated by unit steps through a pawl 89 that is actuated by a relay9|| and which engages the teeth 9| of the ratchet wheel 88. The ratchet is under control of a click 92 that engages the teeth 9| of the ratchet and which is adapted to be released by a relay 93.

.The dialing units which are located at the respective clerk stations may each comprise a base 95 carrying a single contact switch 96 and a double contact switch 91 that are adapted to be actuated upon manipulation of a finger operated disk 98 moving over a fixed dial 99 carrying the numerals l to 9 and zero in exactly the same relation as the ordinary telephone dial. The switches may be enclosed in a housing I00 which carries 5. an oscillatory type of indicator IN. and a pilot light I02, later described. The switch 96 opens a control circuit through conductors I 03 and I04. The switch 91 opens and closes circuit through conductors I05, I06, and I01. The conductor I05 makes connection with the conductor I03 as in-. dicated at I00.

The indicator I0.I is actuated by oppositely ar ranged electromagnets H and III which cause movement thereof from a neutral position to. a position showing an active account when oper-. ated by the electromagnet III and an inactive account when the electromagnet H6 is energized upon closing of a switch I09. in a ground connection I09 as later described.

The pilot light I02 is connected with the conductor I06 through av conductor II2 and hasa round connection H3. The windingsof the elec.-. 'tomagnets H0. and III. are also connected with conductors II5 and II6. The conductors. I03, I04, H5, H6. and I06: are connectedwith the master ccntrol unit 3;.

The, conductor I03, is aground conductor. and isgrou ded to. both the units2 and 3. as indicated at IIJ and H8, The conductor I06. connects with a conductqr. H9 in the unit 3 which leads from a time delay switch I2I. Associated with the time. delay. switch I2I is an electromagnet I that actuates a switch I2I ina conductor I20. The winding of stepper relay I22 is connected with the conductor H9 and operates a contact arm I23 which closes circuit through contacts. I24, I25, I26, I21, I28 and lzsthat are. respectively connected by conductors I30, I3I, I32, I3-3,. I34, and I315 th e in nscf he. relay 10, 9 4I- and 42- respectively.

Qilfcuits are completed; through the windings oi; the respective relays 10; 1.3, 85, 90, III and 42. through ground connections I36, I31 and I38. (Fig, 1) The conductor I04. is connected. with th ccn actarui. I213; by a. conductor. I39; The coh-v ductor I2 0, con ectswith.conductor-I.4.0.as,shown at I40 which leads to the. winding of. a relay mechanism I4I having; a, ground connection. M2.

Th lay mechanism. 4! operates, the mo.v-- able armatures. I4,3.a nd I44. of, the switches I45.- and I46 having fixed contacts. I41 and I49 re.-. pcc iv Th movable contact, members; of the witche and Mfiareccn ected to a. common qq du tor I54. leading. to. one of the output.ter-. millhlscf. acurrentrectificr I52. The. other out: put; terminal of, the rectifier isv connected by a. conductor I53, with the. conductor 64 supplying current to the first switch bank and through the contacts. 51 to the contact arms: 84- of the second switch bank through theconductors 59 depending upon which contact 51 that the arm 56 comes torest as later-described The current is likewise supplied to the switcharm I-2 by way of the conductor I9 depending.

uponthe contact which is engaged by the arm 61 the current finally being completed, through a fuse cylinder I3 ata point depending, upon which.

I I6 by a. conductor I60, and the fixed contact I 15.. connected. with theconductor I-I:5 by. a. conductor I6 I;., Theimovablecontact-arm I59riscon-- The nected with the. conductor I20- by a; conductor indicated at I62.

The time delay device I12 I- receives current from the conductor I54 through. a conductor I64; Also connected with the conductor I54 is a con.- ductor I65 leading to the movable contact. arm I66. of a canceling. switch I61, the fixed contact; of which is. connected by a conductor I68 with the conductor I69. A disk type circuit breaker I10; may be inserted in the conductor 068'.

The current is supplied to, the selenium rectiher through a. transformer I11 having its primary. winding connected with service conductors, I12 and I13 that may be connected with any ava-il=-- able current supply.

An off and on switch, I14 may be inserted in one. of the conductors, for exairiple,v the 00111:- ductors I12. Both conductors. may be provided; with a. fuse I15 and I16 toprotectthe circuits.

The motor 31' has. a ground connection I11; to complete a circuit when, current is supplied. to; the motor 31 through a conductor I18 that con nects with a conductor I19- leading-to the contact I49 of the switch I46.

The master control mechanism. may be provided' with a pilot light I that is connected in; circuit with the contact I41 by a. conductor IOI, the. circuit being completed through a conductor; I82. A. ground is established in. the master control' mechanism as indicatedat- I83, which ground;

, scribed and that a clerk'wishes to check account.

number 138279, the clerk will dial the number by, manipulating the finger desk 98 to dial successively the numerals 1, 3, 8 and following.

When the numeral 1 is dialed, a circuit is closedby the switch 91 from the rectifier I52 byway of the conductors I54, I64, electromagnet: I22; time delay device I2I, electromagnet I22, conductor II9, switch 91, conductor I05 to. ground H1. The flow of current in this circuit. energizes the time delay device I2I and winding. of, the stepper relay I22 to effect movement. of the contact arm I23 to. the contct I24. En-- ergization of the time'delay device I2I also energizes the electromagnet I20: to close the switch. I2I so that a current flows through a circuit:

including the conductors I54 and I65, switch I2I, conductor I20. and relays 15., 93, 41:, and. I23 to retain the pawls in engagement with the. respective ratchet wheels and, prevent retractive rotation thereof.

Simultaneously, a current. flows through the winding of the relay MI by way of. the conductors I54, I65, switch I2I, conductor I20',,conductor, I46 andground I42so as to opencircuitto the signal I80 by breaking the contact I41 in the circuit. which includes the conductors I54and I82. Circuit is also closed through the switch I46 to the motor 31 byway of conductor I54, switch arm I44, contact I49, conductor I19, conductor I18; and ground I11. On the return movement of the. dial, the dial opens and closes theswitch 96- so. as to efiect a single impulse through the electromagnet 10 and effect advancement of the first stage switch one pin or ten contacts. effected by the current flowing from the rectifier through conductors I54, I64, II9, I06, I05; I04, I39, contact arm I23; conductor I30, winding of theelectromagnet 10' and conductor I136 to ground. When the dial returns to rest posi-- tion; the switch 91 is opened'so that circuit is This is- 7 opened through the winding of the stepper relay I22.

The second numeral of the number, 3, is now dialed. During this dialing, the time delay device is still activated so that the electromagnets controlling the pawls retain the pawls in position for preventing retractive rotation of the respective ratchet wheels. When the switch arm 91 makes contact, the winding of the electro magnet I22 is again energized so that the contact arm I23 is advanced to the second contact I25. A current is then established through the conductor I3I to energize the electromagnet 13 and effect actuation of the pawl H to advance the ratchet wheel 66 three teeth.

The numeral 8 is then dialed to again cause energization of the electromagnet I22 to advance the contact arm I23 to the contact I26. On return movement of the dial, circuit is made and broken eight times by the switch arm 96 which causes eight impulses to pass through the conductor I32 and winding of the electromagnet 85 of the second stage switch to cause the pawl 86 to advance the ratchet wheel 88 eight pins.

On dialing the numeral 2, the electromagnet I22 is again energized to advance the switch arm to the contact arm I21 whereupon the current passes through the conductors I33 and winding of the electromagnet 90 to cause the pawl 89 to advance the ratchet wheel of the second stage switch two teeth.

On dialing the numeral '7, the electromagnet I22 is again energized. This advances the switch arm I23 to the contact I28 and on return movement of the dial, seven impulses are caused to occur in the circuit including the conductor I34 and winding of the electromagnet 4| to advance the ratchet wheel 38 seven pins.

When the numeral 9 is dialed, the switch I23 is caused to engage the contact I29 so that on return movement of the dial, nine impulses are effected through the conductor I35 and winding of the electromagnet 43 to advance the ratchet wheel for the fuse bank nine teeth.

The stage switches are now set up so that a current flows from the rectifier through the conductors I54, I65, switch I2I', conductors I20 and I55, winding of the relay I55, conductor I69 and conductor 28 through the fuse cylinder which is then in circuit for example the cylinder 23, providing that the fuse cylinder is intact at the point making connection with the contact 9 that is then in circuit as set up by the dialing operations.

The current is completed through the contact arm I2, which is in engagement with the selected contact 9, collector ring I6, brush I1, connection I8 and conductor I9 to the contact 11 of the second stage switch 2| which is in engagement with the contact arm 8 I. The current continues through the collector ring 80 and brush 82 through the connection 64, conductor 59, the contact 51 that is in connection therewith, the switch arm 56, collector ring 54, brush 62 and conductor 64, conductor I53 back to the rectifier I52.

The clerk then closes the manual switch I09 so that the indicating device IOI is in circuit. If the fuse element has been fused and the circuit open, no current flows through the electromagnet I55. Therefore, when the switch I09 is closed the switch arm I59 retains its engagement with the contact I51 and a signal current flows from the rectifier through the conductors I54, I65, switch I2I, conductor I20, conductor I62, switch arm I59, switch contact I51, conductor I60, conductor H6, and winding of the electromag- 8'- net III to cause actuation of the indicator IN to indicate that the account is inactive, the circuit being completed through the conductor I09 to the ground I09".

If the point of contact of the fuse element has not been fused, the circuit therethrough is completed so that current flows through the winding of the electromagnet I55. Therefore, when the clerk closes the switch I09, current passes through the conductor I54, I65, switch I2I', conductor I20, conductor I62, switch arm I59, contact I58, conductor I6I, conductor II5, winding of the elcctromagnet IIO, conductor I09, switch I09 to ground. This flow of current energizes the electromagnet III] to move the indicator IOI so as to show that the account is active.

The clerk has a given time to dial an account number and obtain the desired information. After this interval has expired, the time delay device I2I opens the circuit to the relay I20 so that the switch I2 I thereof opens and opens circuit to all of the electromagnets controlling the clicks of the respective ratchet wheels, whereupon the coil springs 61 are active in returning the various switch arms I23, I56, BI and I2 to their neutral positions. Opening of the switch I2I' also breaks the circuit through the relay MI, and the switch arm I44 opens to break the current to the electric motor 31 which assists the electromagnets of the fuse switch unit to move the quill shafts of the respective units thereof.

Inactive account numbers are set up as follows:

When an account is determined to be inactive, the number is set up as when the number for that account is dialed. After the number has been dialed, the switch I66 is closed manually so that a fusing current passes from the rectifier through the conductor I54, I65, switch I61, conductor I68, circuit breaker I10, conductor I68, conductor I69, conductor 28, fuse cylinder, contact 9, the switch arm I2 that is engaged with the contact 9, collector ring I6, brush I1, conductor I9, contact 11, switch arm 8| engaged with that contact, collector ring 80, brush 82, conductor 59, contact 51, switch arm 56, collector ring 54, brush 62, conductor 64, and conductor I53 to the oppo site terminal of the rectifier.

Since this circuit does not include any of the electromagnets and particularly the winding of the relay I55, it is sufhcient to effect fusing of the fuse element at the point conforming with the number of the account that has been declared inactive. It is thus obvious that the fuse switch unit is set up to show inactive accounts when the numbers for those accounts have been set up and a fusing current has been passed through the corresponding points of the fuse elements.

From the foregoing, it is obvious that I have provided a checking apparatus for setting up and remotely indicating the condition of accounts so that a clerk or other person desiring to check the activity of an account may quickly, by a dialing operation, determine .the condition of an account at his station without waiting to obtain clearance of a sale through the accounting department.

While I have particularly described the invention as adapted to account systems, it is obvious that it may be used for checking other services or transactions where the respective service or transaction is identified by a number.

What I claim and desire to secure by Letters Patent is:

1. In a checking apparatus of the character described, a fuse element, a plurality of contacts in connection with the fuse element, a movable contact adapted to be selectively engaged withany one of said contacts, a circuit including the movable contact and said fuse element, means for-supplying an electric current to said circuit means for remotely actuating the movable contact, a signal connected with said circuit and actuated responsive to the presence or absence of a current flowing through the fuse element, and means connected with said circuit for pass ing a fusing current through the fuse element.

2. In a checking apparatus of the character described, a plurality of fixed contacts, a fuse element contacting all of the fixed contacts, a movable contact adapted to be engaged with any one of said contacts, an electrical circuit including the fuse element and said movable contact, signal means having connection with said circuit, means for moving the movable contact to a selected fixed contact for effecting operation of the signal means to indicate condition of the fuse element at the point engaging said selected fixed contact, a current supply for the circuit and means connected with said circuit for passing a fusing current through the fusing element at the contact point of any fixed contact when that fixed contact is engaged by said movable contact.

3. In a checking apparatus of the character described, a plurality of fixed contacts, a fuse element contacting all of the fixed contacts, a

movable contact adapted to be engaged with any one of said contacts, an electrical circuit including the fuse element and said movable contact, signal means having connection with said circuit, means remote from the movable contact for actuating the movable contact to effect operation of the signal, said signal being located at the place of the actuating means, a current supply for said circuit and means for passing a fusing current through the fuse element at any contact point when the contact for that point is engaged by the movable contact.

4. In an apparatus of the character described, a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a supporting shaft coaxially of the disks, a quill shaft rotatable on the supporting shaft, a plurality of contacts carried by the disks, contact arms carried on the quill shaft for engaging the contacts of the respective disks, a ratchet wheel on the quill shaft having peripheral teeth and pawl engaging means arranged in circular series on one face of the ratchet wheel, an electromagnet having a pawl engaging the teeth of the ratchet wheel to rotate the quill shaft to advance said contact armsfrom one contact to the next, an electromagnet having a pawl engaging the pins of the ratchet wheel to rotate the quill shaft to advance the contact arms over ten contacts, a click engageable with the teeth of the ratchet wheel to prevent retractive movement of the quill shaft, an electromagnet for releasing the click, and means for rotating the quill shaft in reverse direction upon release of the click.

5. In an apparatus of the character described, a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a supporting shaft coaxially of the disks, a quill shaft rotatable on the supporting shaft, a plurality of contacts carried by the disks, contact arms carried on the 10. quill shaft for engaging the contacts of the respective disks, a ratchet wheel on the quill shaft having peripheral teeth and pawl engaging means arranged in circular series on one face of the ratchet wheel, an electromagnet having a pawl engaging the teeth of the ratchet wheel to rotate the quill shaft to advance said contact arms from one contact to the next, an elec-:

tromagn'et having a pawl engaging the pins of the ratchet wheel to rotate the quill shaft to advance the contact arms over ten contacts, a

click engageable with teeth of the ratchet wheelto prevent retractive movement of the quill shaft,

an electromagnet forreleasing the click, means for rotating the quill shaft in reverse directionupon release of the click, a motor, and a slip driving connection between the motor and the quill shaft to assist the electromagnets in rotating the quill shaft.

6. In an apparatus of the character described,

a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a switch bank including a disk having a plurality of contacts,

shafts having rotational support coaxially of the disks of the switch bank and said fuse unit, arms on the shafts corresponding to the number of disks associated with said shafts and movable over the contacts of the respective disks, current carrying means connecting the contacts of the switch bank with the contact arms of the fuse unit, means for rotating the shafts to advance said contact arms a contact at a time, and separate means for advancing the shafts to advance the contacts a multiple of said contacts at w a time.

'7. In an apparatus of the character described, a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a switch bank including a disk having a plurality of contacts, shafts having rotational support coaxially of the disks of the switch bank and said fuse unit, arms on the shafts corresponding to the number of disks associated with said shafts and movable over the contacts of the respective disks, current carrying means connecting the contacts of the switch bank with the contact arms of the fuse unit, means for rotating the shafts to advance said contact arms a contact at a time, separate means for advancing the shafts to advance the contacts a multiple of said contacts at a time, and means remote from the fuse unit to energize said advancing means.

8. In an apparatus of the character described, a fuse unit including a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a switch bank ineluding a disk having a plurality of contacts, shafts having rotational support coaxially of the disks of the switch bank and said fuse unit, arms on the shafts corresponding to the number of disks associated with said shafts and movable over the contacts of the respective disks, current carrying means connecting the contacts of the switch bank with the contact arms of the fuse unit, means for rotating the shafts to advance said contact arms a contact at a time, separate means for advancing the shafts to advance the contacts a multiple of said contacts at a time, and means remote from the fuse .unit to encrgize said advancing means, said last named 11 means including a dialing mechanism and circuits connecting the dialing mechanism with said advancing means.

9. In an apparatus of the character described, a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a switch bank including a disk having a plurality of contacts, shafts having rotational support coaxially of the disks of the switch bank and said fuse unit, arms on the shafts corresponding to the number of disks associated with said shafts and movable over the contacts of the respective disk, current carrying means connecting the contacts of the switch bank with the contact arms of the fuse unit, means for rotating the shafts to advance said contact. arms a contact at a time, separate means for advancing the shafts to advance the contacts a multiple of said contacts at a time, means remote from the fuse unit to energize said advancing means, said last named means including a dialing mechanism and circuits connecting the dialing mechanism with said advancing means, a signal circuit associated with the dialing circuits and having connection with the fuse element, and signal means in the signal circuit.

10. In an apparatus of the character described, a fuse unit including, a plurality of insulating disks each having a plurality of individual contacts, a fuse element extending about the disks and engaging said contacts, a shaft coaxially of the disks, a second stage switch bank having a plurality of contacts carried by the disks, a first stage switch bank including a disk having a plurality of contacts, shafts having rotational support coaxially of the disks of the switch banks and said fuse unit, arms on the shafts corresponding to the number of disks as-- sociated with said shafts and movable over the contacts of the respective disks, electric conductors connecting the contacts of the first stage bank with the contact arms of the second stage bank, conductors connecting the contacts of the second stage bank with the contact arms of the fuse unit, ratchet wheels on the shafts having peripheral teeth and pins arranged in circular series on the faces of the respective ratchet wheels, electromagnets having pawls engaging the teeth of the ratchet wheels, electromagnets having pawls for engaging the pins of the ratchet wheels, a selector switch having contacts corresponding with the electromagnets, said selector switch having a movable contact arm, electrical conductors connecting the contacts with their corresponding electromagnets, means for effecting movement of the last named contact arm in progressive movement over the contacts of the selector switch, means for remotely actuating said means including means for effecting current pulsations through the electromagnets in circuit with the contact arm of the selector switch, indicating means including an electric circuit for actuating the indicating means, and means responsive to presence and absence of current flow through the fuse unit for indicating condition of the fuse element at the point of contact with a contact in circuit with the current supply as set up by the current impulses produced in the electromagnets.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 916,280 Donitz Mar. 23, 1909 1, 96,101 Schmitt June 3, 1924 1,498,544 Fowler June 24, 1924 2,446,643 Farmer Aug. 10, 1948 

